#include "mystdio.h"
#include <unistd.h>
#define Filename "test.txt"

int main()
{
    _FILE* fp = _fopen(Filename,"w");
    if(fp == NULL) return 1;
    const char* msg = "hell world\n";
    int cnt = 10;
    while(cnt)
    {
        _fwrite(fp,msg,strlen(msg));
        sleep(1);
        cnt--;
    }
    _fclose(fp);
    return 0;
}
